Human ocular thelaziasis in Karnataka

Abstract

Thelaziasis is an arthropod-born disease of the eye and adnexa caused by Thelazia callipaeda, a nematode parasite transmitted by drosophilid flies to carnivores and humans. Because of its distribution mainly confined to South Asian countries and Russia, it is commonly known as Oriental eye worm. It is often under-reported and not been given its due clinical importance. We report first case of human thelaziasis from Hassan District, Karnataka. Five creamy-white, translucent worms were removed from the conjunctival sac of a 74-year-old male patient. Based on morphological characters, the worms were identified as nematodes belonging to the genus Thelazia and speciation was confirmed by CDC, Atlanta as callipaeda. Rarity of the disease and its ability to cause both extra and intraocular manifestations leading to ocular morbidity is the reason for presenting this case. From the available data, this is the first case report from Karnataka, India.

Figure 1

Anterior end demonstrating the mouth and esophagus

Figure 2

The body with transverse cuticular striations

Figure 3

Posterior curved end of the worm